He did nothing worthy of being fired. No biblical grounds were given, let alone, seriously considered. There are numerous Christian leaders who have committed sins worthy of discipline. Patterson is not one of them.
The age of the earth is a hotly debated issue among evangelicals. Old Earthers believe, like most scientists, that the universe is billions of years old. Young Earthers measure the age of the universe in terms of thousands of years. The debate is not new, but the insistence by some Young Earthers that belief in the inerrancy of the Bible demands a Young Earth position is relatively new.